<html>
<head></head>
<body>
There should be a green square, followed by 6 squares of shades of green from white to full green.<br>
<canvas id="canvas" width="700" height="100" ></canvas>
<script>
var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");
context.fillStyle = 'green';
context.fillRect(0,0,100,100);
var context2 = canvas.getContext("2d");
context2.globalAlpha = 0.0;
context2.drawImage(canvas, 0, 0, 100, 100, 100, 0, 100, 100);
context2.globalAlpha = 0.2;
context2.drawImage(canvas, 0, 0, 100, 100, 200, 0, 100, 100);
context2.globalAlpha = 0.4;
context2.drawImage(canvas, 0, 0, 100, 100, 300, 0, 100, 100);
context2.globalAlpha = 0.6;
context2.drawImage(canvas, 0, 0, 100, 100, 400, 0, 100, 100);
context2.globalAlpha = 0.8;
context2.drawImage(canvas, 0, 0, 100, 100, 500, 0, 100, 100);
context2.globalAlpha = 1.0;
context2.drawImage(canvas, 0, 0, 100, 100, 600, 0, 100, 100);
</script>
</body>
</html>
